Maybe it's relative to tank conditions. I have never witnessed it in any of my systems, not saying it isn't true, I have never seen, heard locally or witnessed it.
Moving or repetitive moving is stressful in and of itself, which only causes a delay in growth and short term expansion. This is widely known and excepted. If you take two frags of 10 polyps and attach them to two separete rocks, then place one rock on the reef in a sweet spot and place the other rock next to it for one week. Then move rock A every 3 days to a new place in the tank, I will bet my most prized palys that rock B which remained stationary will have a better growth rate than rock A. If you did the same and fragged a polyp off of one of those rocks every week, the growth rate of the fragged stationary rock would exceed that of the fragged and constantly relocated rock. My experience, and I'm only speaking of me, is constantly moved rocks slows growth and repetitive premature fragging slows growth. Premature fragging can, will and has killed an awful lot of polyps. High prices has caused the death of many polyps as some reefers will immediately chop off a polyp to sale it when it appears. This constant chopping can cause mortality. Not trying to go there with this discussion, it was just a relative comment as it relates to growth, movement and fragging.
Mucho Reef